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74AHCT244D Datenblatt(PDF) 8 Page - NXP Semiconductors

Teilenummer 74AHCT244D
Bauteilbeschribung  Octal buffer/line driver; 3-state
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74AHCT244D Datenblatt(HTML) 8 Page - NXP Semiconductors

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74AHC_AHCT244_5
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 05 — 20 December 2007
8 of 16
NXP Semiconductors
74AHC244; 74AHCT244
Octal buffer/line driver; 3-state
[1]
Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V).
[2]
tpd is the same as tPLH and tPHL.
ten is the same as tPZL and tPZH.
tdis is the same as tPLZ and tPHZ.
[3]
CPD is used to determine the dynamic power dissipation PD (µW).
PD =CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in Volts.
11. Waveforms
For type 74AHCT244
tpd
propagation
delay
nAn to nYn; see Figure 6
[2]
VCC = 4.5 V to 5.5 V
CL = 15 pF
-
3.5
7.4
1.0
8.5
1.0
9.5
ns
CL = 50 pF
-
5.0
8.4
1.0
9.5
1.0
10.5
ns
ten
enable time
nOE to nYn; see Figure 7
VCC = 4.5 V to 5.5 V
CL = 15 pF
-
3.5
10.4
1.0
12.0
1.0
13.0
ns
CL = 50 pF
-
5.5
11.4
1.0
13.0
1.0
14.5
ns
tdis
disable time
nOE to nYn; see Figure 7
[2]
VCC = 4.5 V to 5.5 V
CL = 15 pF
-
5.0
9.4
1.0
10.0
1.0
12.0
ns
CL = 50 pF
-
7.0
11.4
1.0
13.0
1.0
14.5
ns
CPD
power
dissipation
capacitance
per buffer;
CL =50pF;f=1 MHz;
VI = GND to VCC
[3]
-12
-
-
-
-
-
pF
Table 7.
Dynamic characteristics …continued
GND = 0 V. For test circuit see Figure 8.
Symbol Parameter
Conditions
25
°C
−40 °C to +85 °C −40 °C to +125 °C Unit
Min
Typ[1] Max
Min
Max
Min
Max
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 6.
Propagation delay input (nAn) to output (nYn)
mna171
nAn input
nYn output
tPLH
tPHL
GND
VI
VM
VM
VM
VM
VOH
VOL


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